Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1190489e425d327…

MALICIOUS

PDF

96.7 KB Created: 2021-10-09 02:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70d92c838d24fb7e4bdc90d4a757a8b5 SHA-1: 8ad9662a26b64a1973e50551fb61a2c5e503af35 SHA-256: f1190489e425d3279c5a607ccd8c0cd6a1c33515fddeaee902c123d5869a7ef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to potentially compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://labotinnghia.com/img/files/sorigapupapawix.pdf In PDF document text
    • https://mattress-leader.com/media/nidesuf.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/12061275643.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/51100621997.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/zujebovemodefapadi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/50940755167.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/zezaliz.pdfIn PDF document text
    • https://insp.biz/img/file/79646409701.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/satuget.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/leworolupozufifunakup.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614980958cff0---50793431958.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/87187748300.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/786394856.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/suzonevofipipuxuzoremoba.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021100902052373499.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/setobuvufu.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/89929990735.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b210a1ac58---kinodozevexururajen.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/ninusegigavamixojuxez.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/92491940890.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912111031_l0s5u9.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615702d40f9dc---kudidujul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=halloween+2018+for+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 17556 bytes
SHA-256: 5be21518633cee84304476ebfc647e812551dc981620418b63e955a4c5b6a5ad
font_02_sfnt_off00015d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8A 10428 bytes
SHA-256: 9f5bd29866c6e69f4b5979d48cef585cdfa540b892bfd4fcf75abcaa49471306